单选题:The most crucial problem any economic system faces is how t 题目分类:理工类 题目类型:单选题 查看权限:VIP 题目内容: The most crucial problem any economic system faces is how to use its scarce resources. A.puzzling B.difficult C.terrifying D.urgent 参考答案: 答案解析:
关于喉错误的是 ( ) 关于喉错误的是 ( ) A.位于第4~6颈椎高度 B.前方有喉结 C.声门裂是左、右声襞间裂隙 D.喉前庭在前庭裂以上 E.喉中间腔在声门裂以下 分类:理工类 题型:单选题 查看答案